<% Call Com_CreatValidCode() 

Sub Com_CreatValidCode() ' 禁止缓存 
Response.Expires = -9999 
Response.AddHeader "Pragma","no-cache" 
Response.AddHeader "cache-ctrol","no-cache" 
Response.ContentType = "Image/BMP" 
Randomize 
Dim i, ii, iii 
Const cAmount = 36 ' 文字数量 
Const cCode = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" ' 颜色的数据(字符，背景) 
Dim vColorData(2) 
a=Rnd * 256 
b=Rnd * 256 
c=Rnd * 256 
vColorData(0) = ChrB(a) & ChrB(b) & ChrB(c) 'vColorData(0) = ChrB(0) & ChrB(0) & ChrB(0) ' 蓝0，绿0，红0（黑色）0的位置颜色 
vColorData(1) = ChrB(255) & ChrB(255) & ChrB(255) ' 蓝250，绿236，红211（白色） 1的位置颜色 ' 随机产生字符 
Dim vCode(4), vCodes 
For i = 0 To 3 
vCode(i) = Int(Rnd * cAmount) 
vCodes = vCodes & Mid(cCode, vCode(i) + 1, 1) 
Next 
session("CheckCode") = vCodes '记录入Session ' 字符的数据 
Dim vNumberData(36) 
vNumberData(0) = "1110000111110111101111011110111101001011110100101111010010111101001011110111101111011110111110000111" 
vNumberData(1) = "1111011111110001111111110111111111011111111101111111110111111111011111111101111111110111111100000111" 
vNumberData(2) = "1110000111110111101111011110111111111011111111011111111011111111011111111011111111011110111100000011" 
vNumberData(3) = "1110000111110111101111011110111111110111111100111111111101111111111011110111101111011110111110000111" 
vNumberData(4) = "1111101111111110111111110011111110101111110110111111011011111100000011111110111111111011111111000011" 
vNumberData(5) = "1100000011110111111111011111111101000111110011101111111110111111111011110111101111011110111110000111" 
vNumberData(6) = "1111000111111011101111011111111101111111110100011111001110111101111011110111101111011110111110000111" 
vNumberData(7) = "1100000011110111011111011101111111101111111110111111110111111111011111111101111111110111111111011111" 
vNumberData(8) = "1110000111110111101111011110111101111011111000011111101101111101111011110111101111011110111110000111" 
vNumberData(9) = "1110001111110111011111011110111101111011110111001111100010111111111011111111101111011101111110001111" 
vNumberData(10) = "1111011111111101111111101011111110101111111010111111101011111100000111110111011111011101111000100011" 
vNumberData(11) = "1000000111110111101111011110111101110111110000111111011101111101111011110111101111011110111000000111" 
vNumberData(12) = "1110000011110111101110111110111011111111101111111110111111111011111111101111101111011101111110001111" 
vNumberData(13) = "1000001111110111011111011110111101111011110111101111011110111101111011110111101111011101111000001111" 
vNumberData(14) = "1000000111110111101111011011111101101111110000111111011011111101101111110111111111011110111000000111" 
vNumberData(15) = "1000000111110111101111011011111101101111110000111111011011111101101111110111111111011111111000111111" 
vNumberData(16) = "1110000111110111011110111101111011111111101111111110111111111011100011101111011111011101111110001111" 
vNumberData(17) = "1000100011110111011111011101111101110111110000011111011101111101110111110111011111011101111000100011" 
vNumberData(18) = "1100000111111101111111110111111111011111111101111111110111111111011111111101111111110111111100000111" 
vNumberData(19) = "1110000011111110111111111011111111101111111110111111111011111111101111111110111110111011111000011111" 
vNumberData(20) = "1000100011110111011111011011111101011111110001111111010111111101101111110110111111011101111000100011" 
vNumberData(21) = "1000111111110111111111011111111101111111110111111111011111111101111111110111111111011110111000000011" 
vNumberData(22) = "1000100011110010011111001001111100100111110101011111010101111101010111110101011111010101111001010011" 
vNumberData(23) = "1000100011110011011111001101111101010111110101011111010101111101100111110110011111011001111000110111" 
vNumberData(24) = "1110001111110111011110111110111011111011101111101110111110111011111011101111101111011101111110001111" 
vNumberData(25) = "1000000111110111101111011110111101111011110000011111011111111101111111110111111111011111111000111111" 
vNumberData(26) = "1110001111110111011110111110111011111011101111101110111110111011111011101001101111011001111110001011" 
vNumberData(27) = "1000001111110111011111011101111101110111110000111111010111111101101111110110111111011101111000110011" 
vNumberData(28) = "1110000011110111101111011110111101111111111001111111111001111111111011110111101111011110111100000111" 
vNumberData(29) = "1000000011101101101111110111111111011111111101111111110111111111011111111101111111110111111110001111" 
vNumberData(30) = "1000100011110111011111011101111101110111110111011111011101111101110111110111011111011101111110001111" 
vNumberData(31) = "1000100011110111011111011101111101110111111010111111101011111110101111111010111111110111111111011111" 
vNumberData(32) = "1001010011110101011111010101111101010111110101011111001001111110101111111010111111101011111110101111" 
vNumberData(33) = "1000100011110111011111101011111110101111111101111111110111111110101111111010111111011101111000100011" 
vNumberData(34) = "1000100011110111011111011101111110101111111010111111110111111111011111111101111111110111111110001111" 
vNumberData(35) = "1100000011110111011111111101111111101111111110111111110111111111011111111011111111101110111100000011" 

' 输出图像文件头 
Response.BinaryWrite ChrB(66)&ChrB(77)&ChrB(230)&ChrB(4)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(54)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(40)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(40)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(10)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(1)&ChrB(0)

'输出图像信息头
Response.BinaryWrite ChrB(24)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(176)&ChrB(4)&ChrB(0)&ChrB(0)&ChrB(18)&ChrB(11)&ChrB(0)&ChrB(0)&ChrB(18)&ChrB(11)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(0)&ChrB(0)
For i = 9 To 0 Step -1 ' 历经所有行 
	For ii = 0 To 3 ' 历经所有字 
		For iii = 1 To 10 ' 历经所有像素 ' 逐行、逐字、逐像素地输出图像数据 ,仔细分析这里。 
			If Rnd * 99 + 1 < 5 Then ' 随机生成杂点 5是出现机率，可修改
				Response.BinaryWrite vColorData(0) 
			Else 
				Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii, 1)) 
			End If
		Next 
	Next 
Next 
End Sub %>

<script language="javascript">

                var D=new Date();

                var hh=D.getHours();

                var mm=D.getMinutes();

                var ss=D.getSeconds();

//document.write("<img src=checkcode_t.asp?time=" + hh + ":" + mm + ":" + ss + " width=120 height=20>");

</script>